private void AddOption(OptionAttributeBase optionAttr, PropertyInfo prop)
{
CommandOption option;
switch (optionAttr)
{
case HelpOptionAttribute h:
option = h.Configure(App);
break;
case OptionAttribute o:
option = o.Configure(App, prop);
break;
case VersionOptionAttribute v:
option = v.Configure(App);
break;
default:
throw new ArgumentOutOfRangeException();
}
foreach (var attr in prop.GetCustomAttributes().OfType <ValidationAttribute>())
{
option.Validators.Add(new AttributeValidator(attr));
}
if (option.OptionType == CommandOptionType.NoValue && prop.PropertyType != typeof(bool))
{
throw new InvalidOperationException(Strings.NoValueTypesMustBeBoolean);
}
if (option.ShortName != null)
{
if (_shortOptions.TryGetValue(option.ShortName, out var otherProp))
{
throw new InvalidOperationException(
Strings.OptionNameIsAmbiguous(option.ShortName, prop, otherProp));
}
_shortOptions.Add(option.ShortName, prop);
}
if (option.LongName != null)
{
if (_longOptions.TryGetValue(option.LongName, out var otherProp))
{
throw new InvalidOperationException(
Strings.OptionNameIsAmbiguous(option.LongName, prop, otherProp));
}
_longOptions.Add(option.LongName, prop);
}
var setter = ReflectionHelper.GetPropertySetter(prop);
switch (option.OptionType)
{
case CommandOptionType.MultipleValue:
var collectionParser = CollectionParserProvider.Default.GetParser(prop.PropertyType);
if (collectionParser == null)
{
throw new InvalidOperationException(Strings.CannotDetermineParserType(prop));
}
OnBind(o =>
setter.Invoke(o, collectionParser.Parse(option.LongName, option.Values)));
break;
case CommandOptionType.SingleValue:
var parser = ValueParserProvider.Default.GetParser(prop.PropertyType);
if (parser == null)
{
throw new InvalidOperationException(Strings.CannotDetermineParserType(prop));
}
OnBind(o =>
{
var value = option.Value();
if (value == null)
{
return;
}
setter.Invoke(o, parser.Parse(option.LongName, value));
});
break;
case CommandOptionType.NoValue:
OnBind(o =>
setter.Invoke(o, option.HasValue()));
break;
default:
throw new ArgumentOutOfRangeException();
}
}
